atomic mass number
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Related to atomic mass number: Isotopes
a·tom·ic mass num·ber
(ă-tom'ik mas nŭm'bĕr)The mass of the atom of a particular isotope relative to hydrogen 1 (or to one twelfth the mass of carbon 12), generally very close to the whole number represented by the sum of the protons and neutrons in the atomic nucleus of the isotope; it is not to be confused with the atomic weight of an element, which may include a number of isotopes in natural proportion.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
atomic mass number
A number equal to the sum of all the neutrons and the protons in an atom's nucleus.
See: mass numberSee also: number
Medical Dictionary, © 2009 Farlex and Partners
a·tom·ic mass num·ber
(ă-tom'ik mas nŭm'bĕr)The mass of the atom of a particular isotope relative to hydrogen 1 (or to one twelfth the mass of carbon 12), generally very close to the whole number represented by the sum of the protons and neutrons in the atomic nucleus of the isotope; it is not to be confused with the atomic weight of an element, which may include a number of isotopes in natural proportion.
Medical Dictionary for the Dental Professions © Farlex 2012